David Gembala
Commercial Roofing Executive · Publisher, National Roofing Alliance
David Gembala is a commercial roofing executive whose career centers on commercial roofing systems. His work spans the full arc of a commercial roof — specification, installation, and the long maintenance horizon that determines whether an assembly reaches its design life.
He publishes the National Roofing Alliance as an editorial resource, distilling working commercial roofing practice into guidance that building owners, facility managers, and contractors can act on. His perspective is shaped by hands-on roofing leadership and a focus on the decisions that determine how long a commercial roof lasts.
What David covers
David's work — and the guidance he publishes here — centers on the decisions that determine whether a commercial roof reaches its service life, not on product pitches. The throughline is practical: get the fundamentals right and a commercial roof lasts decades; get them wrong and it fails early and expensively.
That means substrate preparation and moisture control, choosing the right membrane and system for the building rather than the brochure, the flashing and penetration details where most leaks begin, positive slope and drainage, and the maintenance cadence that protects the investment. The commercial roofing best-practices guide walks through these in order.
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